Notes:
Local on chalk and limestone grassland, sand-dunes and shingle beaches throughout England. In Hampshire locally common on the chalk and in places on the coast, well-known localities being Martin Down, Broughton Down, Danebury and other places on the chalk around Winchester, and Noar Hill. Relatively scarce on the Isle of Wight but increased effort has revealed it still occurs, particularly on the south-east coast. Wingspan 42-48 mm. The main confusion species is Light Arches A. lithoxylaea, which see. Larva feeds on flowers and seeds of various grasses.